The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 02, 1976
Filed:
Mar. 13, 1975
Myron E Ferguson, Cupertino, CA (US);
California Microwave, Inc., Sunnyvale, CA (US);
Abstract
A transceiver comprising a transmit circuit for receiving a transmit audio frequency signal from a voice input transducer and including a delay line for delaying the transmit audio frequency signal, a modulator for converting the delayed transmit audio frequency signal to a transmitable radio frequency signal and a first switchable attenuator responsive to a control signal and operative to selectively couple the radio frequency signal to an output terminal for transmission; a receive circuit for receiving a responsive radio frequency transmission and including a demodulator for converting the received radio frequency signal to a received audio frequency signal, and a second switchable attenuator responsive to the control signal and operative to selectively couple the received audio frequency signal to a voice output transducer; and a control circuit including a transmit detector for detecting the transmit audio frequency signal level, a receive detector for detecting the received audio frequency signal level, and a comparator for comparing the outputs of the transmit detector and receive detector and developing the control signal.